Sacrospinous ligament

A critical ligament that stabilizes the pelvis and connects the sacrum to the ischial spine.

The sacrospinous ligament is a triangular-shaped structure located in the pelvic region. It extends from the sacrum, specifically the lower portion of the sacral vertebrae, to the ischial spine, which is part of the hip bone. This ligament plays a vital role in supporting the pelvis and maintaining its integrity during movement.

Terminologia Anatomica

ligamentum sacrospinosum

System

Skeletal system

Function

One of the primary functions of the sacrospinous ligament is to provide stability to the pelvis, especially during activities involving movement and weight-bearing. It helps to prevent excessive movement between the sacrum and the ischial spine, thereby maintaining the structural integrity of the pelvis. Additionally, the sacrospinous ligament serves as an attachment point for various muscles and fascia, which assist in pelvic function and mobility. This ligament also plays a role in the formation of the greater and lesser sciatic foramina, which are essential pathways for nerves and vessels that supply the lower limb.

Location

The sacrospinous ligament is situated in the posterior part of the pelvis. It originates from the sacrum, specifically from the lateral aspect of the lower sacral vertebrae, and extends downward to the ischial spine located on the hip bone. The ligament is positioned inferior to the sacrotuberous ligament, another important ligament of the pelvis, and works in conjunction with it to provide support and stability to the sacroiliac joint and the overall pelvic structure. Its anatomical location makes it a crucial component in both pelvic anatomy and function.

Did You Know?

The sacrospinous ligament is often assessed in pelvic surgeries due to its critical role in pelvic stability.
This ligament is involved in forming two important openings for nerves and blood vessels in the hip region.
In women, the sacrospinous ligament can be affected during childbirth, which may lead to variations in pelvic support.